body{
    background: #fff !important;
}
ul,li{
    list-style: none;
}
.w {
  width: 1200px;
  margin: 0 auto;
}
 /*引入图标字体    */
@font-face {
  font-family: "iconfont";
  src: url(../fonts/iconfont.ttf);
}
.iconfont {
  font-family: "iconfont" !important;
  font-size: 16px;
  font-style: normal;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  margin: 0;
  padding: 0;
}
.body img {
  width: 100%;
}
.advantage {
  margin-top: 72px;
  margin-bottom: 72px;
  text-align: center;
}
.advantage h3 {
  font-family: SourceHanSansCN-Light;
  font-size: 48px;
  color: #2e2e2e;
}
.advantage h5 {
  width: 882px;
  font-family: SourceHanSansCN-Light;
  font-size: 18px;
  color: #444343;
  margin: 40px auto 64px;
}
.advantage .w {
  display: flex;
  height: 550px;
  background-image: linear-gradient(153deg, #72757e 0%, #3b3b45 100%), linear-gradient(#61616b, #61616b);
  background-blend-mode: normal, 
        normal;
}
.advantage .w li {
  position: relative;
  border-right: 1px solid #7a7d87;
  text-align: center;
  padding: 0 38px;
  box-sizing: border-box;
}
.advantage .w li h4 {
  position: relative;
  width: 220px;
  height: 100px;
  line-height: 88px;
  border: solid 6px #fffd48;
  font-family: SourceHanSansCN-Medium;
  font-size: 28px;
  color: #ffffff;
  margin: 114px auto 40px;
  box-sizing: border-box;
}
.advantage .w li p {
  font-family: SourceHanSansCN-Light;
  font-size: 14px;
  line-height: 30px;
  color: #c5c8cf;
}
.advantage .w li h4::before,
.advantage .w li h4::after {
  position: absolute;
  content: "";
  width: 16px;
  height: 7px;
  background-color: #61616b;
  transform: skewX(50deg);
  transition: 0.5s linear;
}
.advantage .w li h4::before {
  top: -6px;
  left: 10px;
}
.advantage .w li h4::after {
  bottom: -7px;
  right: 10px;
}
.advantage .w li h4:hover::before {
  left: 86%;
}
.advantage .w li h4:hover::after {
  right: 86%;
}
.advantage .w li::before,
.advantage .w li::after {
  position: absolute;
  content: "";
  width: 7px;
  height: 22px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #ffffff;
}
.advantage .w li::before {
  top: 0;
}
.advantage .w li::after {
  bottom: 0;
  width: 7px;
  height: 22px;
  background-color: #ffffff;
}
.case {
  padding: 70px 0 88px;
  background: url(../images/promo_case_back.png);
  text-align: center;
}
.case h4 {
  font-family: SourceHanSansCN-Light;
  font-size: 48px;
  color: #ffffff;
}
.case p {
  font-family: SourceHanSansCN-Light;
  font-size: 18px;
  color: #ffffff;
}
.case .case_img {
  display: flex;
  flex-wrap: wrap;
  margin-top: 62px;
}
.case .case_img li {
  position: relative;
  width: 25%;
}
.case .case_img li img {
  width: 100%;
  vertical-align: top;
}
.case .case_img li p {
  position: absolute;
  bottom: 0;
  width: 100%;
  height: 48px;
  line-height: 48px;
  background-color: #7d7d7d;
  opacity: 0.75;
  transition: 0.3s linear;
}
.case .case_img li p::after {
  position: absolute;
  content: "\e626";
  font-family: "iconfont";
  font-size: 36px;
  opacity: 0;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}
.case .case_img li:hover p {
  height: 100%;
  line-height: 100%;
}
.case .case_img li:hover p::after {
  opacity: 1;
}
.sort {
  text-align: center;
  background-color: f3f3f3;
  margin: 91px auto 85px;
}
.sort h4 {
  font-family: SourceHanSansCN-Light;
  font-size: 48px;
  color: #2e2e2e;
}
.sort h5 {
  width: 882px;
  font-family: SourceHanSansCN-Light;
  font-size: 18px;
  color: #444343;
  margin: 30px auto 60px;
}
.sort .sort_img {
  display: flex;
}
.sort .sort_img li {
  position: relative;
}
.sort .sort_img li p {
  position: absolute;
  display: flex;
  justify-content: center;
  align-items: center;
  font-family: SourceHanSansCN-Regular;
  font-size: 30px;
  color: #ffffff;
  transition: 0.3s linear;
}
.sort .sort_img img {
  vertical-align: top;
  width: 100%;
}
.sort .sort_img .sort_left .sort_left_top {
  display: flex;
  margin-bottom: 10px;
}
.sort .sort_img .sort_left .sort_left_top li:nth-child(1) {
  margin-right: 10px;
}
.sort .sort_img .sort_left .sort_left_top p {
  top: 0;
  left: 0;
  width: 180px;
  height: 100%;
}
.sort .sort_img .sort_left .sort_left_top li:hover p {
  width: 100%;
}
.sort .sort_img .sort_left .sort_left_bottom {
  display: flex;
}
.sort .sort_img .sort_left .sort_left_bottom li:nth-child(2) {
  margin: 0 10px;
}
.sort .sort_img .sort_left .sort_left_bottom p {
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 92px;
  line-height: 92px;
}
.sort .sort_img .sort_left .sort_left_bottom li:hover p {
  height: 100%;
}
.sort .sort_img .sort_right {
  margin-left: 10px;
}
.sort .sort_img .sort_right p {
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100%;
  height: 160px;
  line-height: 160px;
  background-color: rgba(14, 134, 236, 0.7);
}
.sort .sort_img .sort_right li:hover p {
  height: 100%;
}
.circuit {
  text-align: center;
  margin: 84px auto 106px;
}
.circuit img {
  width: 98%;
}
.circuit h4 {
  font-family: SourceHanSansCN-Light;
  font-size: 48px;
  color: #2e2e2e;
  margin-bottom: 68px;
}
.circuit .circuit_text {
  display: flex;
  justify-content: space-around;
  margin-top: 26px;
}
.circuit .circuit_text li {
  font-family: SourceHanSansCN-Light;
  font-size: 18px;
  color: #444343;
}